I am undergrad doing third year of my engineering. I looked into websites of many US universities for MS Applied math. Most of them require GRE math subject ( as far as I searched)test. The problem is am from engineering background and find it difficult to grasp seemingly simple concepts to math undergrads like limits. I may seem a bit ambitious but want to enter Applied math course to combine both rigor and applications. GRE math subject test seems so extensive in syllabus including Analysis, topology. How do I prepare for this exam? What books will be both rigorous and easy to comprehend( like Spivak Calculus). Also, do I get a chance of doing math in US?